Analysis of Connecting Rod Bearing Wear

Judyta SIENKIEWICZ; Judyta SIENKIEWICZ

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Tytuł: Analysis of Connecting Rod Bearing Wear ; Analysis of Connecting Rod Bearing Wear

Abstrakt:

This paper analyses the wear mechanisms occurring in connecting rod bearings, which are exposed to various mechanical failures, such as incorrect assembly, high loads, extreme temperatures, unsuitable operating conditions, or loss of lubrication. The investigation was conducted on previously collected post-service samples, each evaluated for factors contributing to their wear or damage. The samples came from eight engines belonging to two groups – four- and six-cylinder BMW units installed in vehicles produced during the same time period. Advanced research techniques, such as optical microscopy, surface profilometry, and hardness measurements, were employed for the bearing analysis. Several wear mechanisms were identified, including sliding wear, fatigue wear (characterised by visible cracks and material pull-out), surface discolouration, as well as two-body and three-body abrasive wear (evidenced by friction marks). The research enabled a detailed characterisation of bearing wear mechanisms and improved understanding of the factors influencing their durability under various operating conditions.
; This paper analyses the wear mechanisms occurring in connecting rod bearings, which are exposed to various mechanical failures, such as incorrect assembly, high loads, extreme temperatures, unsuitable operating conditions, or loss of lubrication. The investigation was conducted on previously collected post-service samples, each evaluated for factors contributing to their wear or damage. The samples came from eight engines belonging to two groups – four- and six-cylinder BMW units installed in vehicles produced during the same time period. Advanced research techniques, such as optical microscopy, surface profilometry, and hardness measurements, were employed for the bearing analysis. Several wear mechanisms were identified, including sliding wear, fatigue wear (characterised by visible cracks and material pull-out), surface discolouration, as well as two-body and three-body abrasive wear (evidenced by friction marks). The research enabled a detailed characterisation of bearing wear mechanisms and improved understanding of the factors influencing their durability under various operating conditions.